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theorem proved term proof

multiplicative

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formal statement (Lean)

 774theorem multiplicative (f : JAut) (x y : PosReal) :
 775    f (posMul x y) = posMul (f x) (f y) :=

proof body

Term-mode proof.

 776  f.2.1 x y
 777
 778/-- Cost preservation of a `J`-automorphism. -/

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depends on (9)

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